A very believable portrayal of the variety of ways, both positive, negative, and neutral, that people behave, individually, in groups, and as a culture, when there appears to be no future, no hope, and society condones anybody-who's-not-us-is-not-a-person views. Reminiscent of Quintet (which I DO like ... it's so human) in some respects ... but, of course, very VERY different.
On an odd little sideline, I'd also like to say something about the violence in this movie. As a person who was long-ago turned off of most so-called action films by the let's-do-bigger-and-better-stunts-and-ef
I second hadesgirl: go see it! More than once if possible!
P.S. And now I must acquire and read the P.D. James novel.